Rail systems increase vigilance following bin Laden raid

Industry already guarding against newly uncovered al Qaida plot

"We are and we have been very vigilant about the security of the transit system. Just as we've watched the world events that have occurred not only this week, but over the past 10 years, we've constantly updated and adapted to the new types of threats that are out there," he said. "And, we're actually kind of pleased that this information that has come to light kind of validates some of our thought processes and procedures that we were already guarding for."